<template>
  <view class="">
    <view class="">
      <!-- 使用自定义的搜索组件 -->
      <!--  <my-search :bgcolor="'pink'" :bordRadius="2" @searchClick="gotoSearch"></my-search> -->
      <my-search @searchClick="gotoSearch"></my-search>
    </view>
    <view class="scroll-view-container">
      <!-- 左侧滚动区域 -->
      <scroll-view scroll-y="true" :style="{height:wh+'px'}" class="left-scroll-view">
        <block v-for="(item,index) in cateList" :key="index">
          <view :class="['left-scroll-view-item',active===index?'active':'']" @click="activeChanged(index)">
            {{item.cat_name}}
          </view>
        </block>
      </scroll-view>
      <!-- 右侧滚动区域 -->
      <scroll-view scroll-y="true" :style="{height:wh+'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,index2) in cateLevel2" :key="index2">
          <!-- 二级分类标题 -->
          <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
          <!-- 当前二级分类下的三级分类列表 -->
          <view class="cate-lv3-list">
            <!-- 三级分类的item项 -->
            <view class="cate-lv3-item" v-for="(item3,index3) in item2.children" :key="index3"
              @click="gotoGoodsList(item3)">
              <!-- 三级分类的图片 -->
              <image :src="item3.cat_icon"></image>
              <!-- 三级分类的文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import minxBadge from '@/mixins/tabbar-badge.js'
  export default {
    mixins: [minxBadge],

    data() {
      return {
        wh: 0,
        cateList: [],
        active: 0,
        cateLevel2: [], //二级分类列表
        //滚动条距离顶部的距离
        scrollTop: 0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      //console.log(sysInfo);
      //屏幕可用高度-搜索区的60px
      this.wh = sysInfo.windowHeight - 60
      this.getCateList()
    },
    methods: {
      async getCateList() {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/categories')
        console.log(res);
        if (res.meta.status !== 200) {
          return uni.$showMsg()
        }
        this.cateList = res.message
        //console.log(this.cateList);
        //为二级分类渲染数据
        this.cateLevel2 = res.message[0].children
        //   console.log(this.cateLevel2);
      },
      activeChanged(i) {
        //动态绑定active的值
        this.active = i
        // 更新右侧分类内容，根据左侧的分类项更新二级分类
        this.cateLevel2 = this.cateList[i].children
        //让scrollTop的值在0与1之间切换（距离顶部的值）
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      //跳转到商品列表页面
      gotoGoodsList(item) {
        uni.navigateTo({
          //传参跳转详情页
          url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      //跳转到search页面
      gotoSearch() {
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex
  }

  scroll-view {
    border: 1px solid red;
  }

  .left-scroll-view {
    width: 120px;

    .left-scroll-view-item {
      background-color: #f7f7f7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;

      &.active {
        background: #FFFFFF;
        position: relative;

        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }

  .cate-lv2-title {
    text-align: center;
    font-size: 14px;
    font-weight: 900;
    padding: 14px 0px;
  }

  //三级分类中
  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;

    .cate-lv3-item {
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;

      image {
        width: 60px;
        height: 60px;
      }

      text {
        font-size: 12px;
      }
    }
  }
</style>